Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Are you mounting the NFS volumes with a timeout? I seem to recall that
an NFS timeout can really screw with a system, whether it's primary or
secondary. I usually mount my NFS with the soft,timeo=30 options.
Hope that helps.
> Message: 2
> Date: Wed, 02 Dec 2009 09:21:45 +0000
> From: James Masson <james.masson at tradefair.com>
> Subject: Re: [DRBD-user] Primary not disconnecting Secondary with IO
> problems
> To: drbd-user at lists.linbit.com
> Message-ID: <4B1631A9.4070605 at tradefair.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
>
> has anybody seen this before, got any insight?
>
> James
>
> James Masson wrote:
>
>> Hi list,
>>
>> I'm using DRBD and NFS to provide HA to Virtual Machine images between pairs of storage servers.
>>
>> Systems are RHEL5.4 2.6.18-164.el5 + drbd8.3 from Centos Extras
>>
>> We've been having issues where disk I/O problems on the DRBD Secondary stops all IO to the Primary
>> too. DRBD doesn't seem to recognise these disk I/O problems, the Secondary isn't disconnected
>> automatically. Everything just hangs.
>>
>> During this state:
>> If I try a "drbdadm disconnect all" on the Primary, the command hangs.
>> If I try this on the Secondary, the command eventually completes, and NFS I/O returns to normal
>> operation on the Primary.
>>
>> I've tried the following things to fix this:
>>
>> 1) Putting in a custom local-io-error handler to hard reset the problem node.
>>
>> This never triggers. Just like the default "detach", never triggers.
>>
>> 2) Changing the net connection parameters to:
>>
>> net {
>> ko-count 2;
>> timeout 20;
>> }
>>
>> Again, this never triggers.
>>
>>
>> 3) Changing the protocol used from C to B
>>
>> Doesn't have any effect on the issue - I'd prefer to use C anyway.
>>
>>
>> Any further ideas on how to track this issue down and fix it?
>>
>> thanks
>>
>> James Masson
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>>